The thing that gets me is he says it's at 42 hundered RPM, then 17k, then at the end says 4k.

You can get resonant situations in electromagnetics where is seems like something is getting stronger (i.e. by injecting a small frequency it oscillates into a very strong signal). This really sounds like what's going on, because "it takes a couple times to stick".

I am pretty drunk, and generally shut down the brain on weekends. Thus, even if I'm right I can't tell you where the apparent extra energy is coming from.